1. Clinical Center of Serbia, Clinic of Obstetrics and Gynecology, Belgrade, Serbia
2. Clinical Center of Serbia, Clinic of Obstetrics and Gynecology, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
3. Lincoln County Hospital, PathLinks Pathology Services, Department of Cellular Pathology, Lincoln, UK
4. Nazarbayev University, School of Medicine, Department of Medicine, Astana, Kazakhstan + University Medical Center, National Research Center of Mother and Child Health, Department of Obstetrics and Gynecology, Astana, Kazakhstan + University of Pittsburgh,